The top mosaic is a combination of Sols 170 and 176, taken with the MastCam 34mm. That mosaic consists of 127 raw images each at a resolution of 1344x1200 pixels.
The middle-left mosaic is from Sol 172, taken with the MastCam 100 mm, facing Northwest to Northeast. It consists of 110 raw images each at a resolution of 1408x1200 pixels.
The middle-right mosaic is from Sol 173, also taken with the MastCam 100 mm, facing Southeast to Southwest. It consists of 139 raw images each at a resolution of 1408x1200 pixels.
And finally, the mosaic on the bottom is of the latest rover self portrait taken on Sol 177 by the Mars Hand Lens Imager (MAHLI). This self portrait is comprised of 65 raw images each at a resolution of 1584x1184 pixels. The grand total of raw images for this GigaPan are 351.
Compass points have also been added above the top mosaic.
Additional information may be found hard-coded (text) into the GigaPan itself.
Also, the dust in the raw MAHLI images that make up the self portrait were manually (painstakingly) removed.
Enjoy! There's a lot to look at! :)